I calculated the theoretical sensitivity of the geophones used in SR3:

• Geophones names: 1, 2 and 3.
• The numerical data of the geophones sensitivities is not available, so I took it from the plots using WebPlotDigitizer.
• Below 500 mHz, the calculated and measured values seem to coincide.
• As far as I remember being told, these geophones have been very noisy after installation on the IP table. I need to measure the IP free swing displacement ASD on a day with low micro-seismic in order to compare.